Migrate merging to python

[Aleman-Z]

Merge .continuous files in python instead of using Matlab.

[Aleman-Z]

Remove extra periods of time at end of trials

[Aleman-Z]

measure time

[Aleman-Z]

Add NaN samples when resting period/trial is shorter than 45min/ 5 min

[Aleman-Z]

Consider including merging of synchronization files, plus videos.